Graphene-Based Materials Used as Electrodes in Ni-MH and Li-Ion Batteries

Rechargeable Ni-MH and LIBs have become commercial reality for years [49-51]. Ni-MH battery, using hydrogen storage alloys as the negative electrode materials and Ni(0H)2 as the positive electrode material, has been considered as one of the promising batteries, due to their advantages compared with traditional 

It is known that commercialty available LlBs make use of layered LiCo02 in positive electrodes, though cobalt is expensive and poisonous [51, 62]. Hence, developing both environmentally friendty and cheap electrode materials in place of LiCo02 is an important issue in LIBs. The electrode reaction in LIBs depends upon the simultaneous intercalation/extraction of Li ion and electron into the active electrode materials. 

Source Copyright the Royal Society of Chemistry, reproduced with permission from Ref, 74, 

The cycle life of NGC electrode is shown in Fig. 9.6b. The curves of discharge capacity vs. cycle number present a significant increasing trend. In the total process, the charging capacities always stabilize at 361-365 mAh-g and the Coulombic efficiency gradually increases and keeps at 76-78%. The performances including specific capacity and stability of NGC are superior to those of most micro/nanostructure of j8-Ni(OH)2 [51-53, 56, 57, 76], and very close to nanotubes [76] (Table 9.1). 

We also synthesized Co304 RG0 (CGC] [84], Fe304-C-RG0 [GCF] [85], Sn02-polyaniline-RG0 [SPG] [86], and study their applications as anodes in LlBs. 

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Graphene-Based Materials Used as Electrodes in Ni-MH and Li-Ion Batteries 335... 

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